NIFT UG 2010 Question Paper with solutions

Question : 138 of 149

Marks: +1, -0

The banks of a river are parallel. A swimmer starts from a point on one of the banks and swims in a straight line inclined to the bank at 45° and reaches the opposite bank which is 20 m from the starting point. The breadth of the river is

20 m
$20√2$ m
$20/√2$ m
40 m

Validate

Solution:

Breadth of river is AC.

\;\;{AC}/{AB}=\cos45^{∘}

\;\;{AC}/{20}=\;\;{1}/{√{2}}

AC=\;\;{20}/{√{2}}{m}

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